Related Mcqs:

1. Thermal conductivity of solid metals with rise in temperature normally___________________?

   A. increases
   B. decreases
   C. remains constant
   D. may increase or decrease depending on temperature
   E. unpredictable

2. Thermal conductivity of water in general with rise in temperature ____________________?

   A. increases
   B. decreases
   C. remains constant
   D. may increase or decrease depending on temperature
   E. none of the above

3. Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of__________________?

   A. 0.002
   B. 0.02
   C. 0.01
   D. 0.1
   E. 0.5

4. The thermal diffusivities for solids are generally__________________?

   A. less than those for gases
   B. jess than those for liquids
   C. more than those for liquids and gases
   D. more or less same as for liquids and gases
   E. zerci

5. Unit of thermal conductivity in M.K.S. units is ___________________?

   A. kcal/kg m2 °C
   B. kcal-m/hr m2 °C
   C. kcal/hr m2 °C
   D. kcal-m/hr °C
   E. kcal-m/m2 °C

6. Unit of thermal conductivity in S.I. units is__________________?

   A. J/m2 sec
   B. J/m °K sec
   C. W/m °K
   D. A. and C. above
   E. B. and C. above

7. Thermal conductivity of air with rise in temperature__________________?

   A. increases
   B. decreases
   C. remains constant
   D. may increase or decrease depending on temperature
   E. none of the above

8. Thermal conductivity of a material may be defined as the________________?

   A. quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1°C
   B. quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
   C. heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
   D. all of the above
   E. none of the above

9. Thermal conductivity of glass-wool varies from sample to sample because of variation in ________________ ?

   A. composition
   B. density
   C. porosity
   D. structure
   E. all of the above

10. Thermal conductivity of wood depends on_______________?

    A. moisture
    B. density
    C. temperature
    D. all of the above
    E. none of the above